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Finding the Fourth Proportional to 639.65, 960.25 and 607.36

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Solution

The fourth proportional to 639.65, 960.25 and 607.36 is: 911.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.65 : 960.25 = 607.36 : x
  2. Step 2: Convert to fraction form
    639.65/960.25 = 607.36/x
  3. Step 3: Cross multiply
    639.65x = 960.25 × 607.36
  4. Step 4: Simplify right side
    639.65x = 583,217.44
  5. Step 5: Solve for x
    x = 583,217.44/639.65
  6. Step 6: Final answer
    x = 911.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.